Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-08-24
1997-06-10
Pascal, Robert
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022723, 315159, 315362, G06M 700
Patent
active
056378637
ABSTRACT:
An operatory light fixture having a touchless switch operatively connected to a lamp disclosed. The touchless switch is constructed to detect a user's hand when positioned in a command location relative to the touchless switch and to respond thereto by operating the lamp. In a preferred embodiment, the touchless switch is an active infrared-type switch, comprising means for emitting infrared light toward a command location, means for detecting infrared light reflected from an object such as a hand which is positioned at or near the command location, and relay means responsively connected to the detection means and operatively connected to the lamp. In another preferred embodiment, the touchless switch includes means for discriminating a true signal produced by placement of an object such as a user's hand at the command location, from randomly occurring fluctuations in light intensity in the operatory environment.
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O'Hara Shawn E.
Sanborn Bruce A.
MDT Corporation
Pascal Robert
Philogene Haissa
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